Rubro-olivary fibres descend from the parvocellular division of each red nucleus along the central segmental tracts to reach the capsule (amiculum) of the ipsilateral inferior olivary nucleus (ION). From the ION, olivo-cerebellar fibres cross the contralateral inferior cerebellar peduncle to reach cerebellar cortex, then pass from cerebellar cortex to the contralateral dentate nucleus. Dentatorubral fibres then ascend via the contralateral superior cerebellar peduncle, decussate in the midbrain, and return to the original red nucleus 1.

Note that no direct connecting tract is present between the inferior olivary nucleus and contralateral dentate nucleus 1.